/*
* include / linux / dmapool . h
*
* Allocation pools for DMAable ( coherent ) memory .
*
* This file is licensed under the terms of the GNU General Public
* License version 2 . This program is licensed " as is " without any
* warranty of any kind , whether express or implied .
*/
#ifndef LINUX_DMAPOOL_H
#define LINUX_DMAPOOL_H
#include <linux/nodemask_types.h>
#include <linux/scatterlist.h>
#include <asm /io.h>
struct device;
#ifdef CONFIG_HAS_DMA
struct dma_pool *dma_pool_create_node(const char *name, struct device *dev,
size_t size, size_t align, size_t boundary, int node);
void dma_pool_destroy(struct dma_pool *pool);
void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
dma_addr_t *handle);
void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
/*
* Managed DMA pool
*/
struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
size_t size, size_t align, size_t allocation);
void dmam_pool_destroy(struct dma_pool *pool);
#else /* !CONFIG_HAS_DMA */
static inline struct dma_pool *dma_pool_create_node(const char *name,
struct device *dev, size_t size, size_t align, size_t boundary,
int node)
{
return NULL;
}
static inline void dma_pool_destroy(struct dma_pool *pool) { }
static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
dma_addr_t *handle) { return NULL; }
static inline void dma_pool_free(struct dma_pool *pool, void *vaddr,
dma_addr_t addr) { }
static inline struct dma_pool *dmam_pool_create(const char *name,
struct device *dev, size_t size, size_t align, size_t allocation)
{ return NULL; }
static inline void dmam_pool_destroy(struct dma_pool *pool) { }
#endif /* !CONFIG_HAS_DMA */
static inline struct dma_pool *dma_pool_create(const char *name,
struct device *dev, size_t size, size_t align, size_t boundary)
{
return dma_pool_create_node(name, dev, size, align, boundary,
NUMA_NO_NODE);
}
/**
* dma_pool_zalloc - Get a zero - initialized block of DMA coherent memory .
* @ pool : dma pool that will produce the block
* @ mem_flags : GFP_ * bitmask
* @ handle : pointer to dma address of block
*
* Same as dma_pool_alloc ( ) , but the returned memory is zeroed .
*/
static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
dma_addr_t *handle)
{
return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);
}
#endif
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